'Justified' casts Adam Arkin as Theo Tonin

After directing five episodes of FX’s Justified, including this season’s Dewey Crowe hour (“Holy s—, you mean I had four kidneys?”) and the memorable season 1 finale “Bulletville,” Adam Arkin is ready to step in front of the camera. He’ll guest-star in two episodes later this season as Quarles’ boss Theo Tonin, head of the Detroit Mafia. Look for him in episodes 311 and 313, the latter being the season 3 finale.

In this week’s episode, “The Man Behind the Curtain,” Raylan (Timothy Olyphant) theorized that Theo had banished Quarles (Neal McDonough) to Kentucky because of his penchant for beating up male hustlers. Justified exec producer Graham Yost tells EW we’ll learn more of that backstory in episode 310, before Theo surfaces. Unlike Sammy Tonin (Max Perlich), Theo’s son who is currently paying Quarles a visit, Quarles likes Theo, Yost says. “Theo saved his life, but in a weird way,” he teases.

So will Arkin look as badass as we’d expect for a Detroit mob boss? “I don’t want to give it away. There is a physical tweak that Adam asked for,” Yost says. “Adam wanted to be distinctive, so when you see it, it’s like, Oh wow, that’s pretty wild. He’s not dressed as a pirate or anything. But he looks cool.”